// Tencent is pleased to support the open source community by making TNN available.
//
// Copyright (C) 2020 THL A29 Limited, a Tencent company. All rights reserved.
//
// Licensed under the BSD 3-Clause License (the "License"); you may not use this file except
// in compliance with the License. You may obtain a copy of the License at
//
// https://opensource.org/licenses/BSD-3-Clause
//
// Unless required by applicable law or agreed to in writing, software distributed
// under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
// CONDITIONS OF ANY KIND, either express or implied. See the License for the
// specific language governing permissions and limitations under the License.

#include "tnn/utils/dims_utils.h"

namespace TNN_NS {

DimsVector DimsOffsetUtils::ConvertOffsetToIndex(DimsVector dims, int offset) {
    DimsVector index(dims.size(), 1);
    for(int i = dims.size() - 1; i >=0; --i) {
        index[i] = offset % dims[i];
        offset /= dims[i];
    }
    return index;
}

int DimsOffsetUtils::ConvertIndexToOffset(DimsVector dims, DimsVector index) {
    int offset = 0;
    for(int i = 0; i < dims.size(); ++i) {
        offset = offset * dims[i] + index[i];
    }
    return offset;
}

}  // namespace TNN_NS
